Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

N. Bhattacharya ¹, V. Raiverman ¹

Affiliations
1 Institute of Petroleum Exploration and Directorate of Geology, Oil & Natural Gas Commission, Dehra Dun, IN

Abstract

Clay mineral distribution in Dharmsala sediments over a region extending from Palampur to Mandi and Sarkaghat in northwest India was studied using standard X-ray diffractometer techniques. Lower Dharmsala sediments show uniform clay mineral distribution over the region and contain partially degraded illite and chlorite with minor amounts of kaolinite. Upper Dharmsala sediments seem to vary in clay mineralogy from one part of the region to another. They are characterized by the presence of illite, chlorite and vermiculite at Palampur-Baijnath. The clay minerals are mainly degraded illite, vermiculite and expandable mixed layers at Jogindernagar-Mandi and Rewalsar areas. Upper Dharmsala clays at Sarkaghat consist of montmorillonite, expandable mixed layers and minor amounts of highly degraded chlorite. Differences in clay mineral distribution over the region is explained here by variations in the characters of source rocks, weathering intensity, sediment transport, drainage and topography. The present findings are compatible with information obtained from paleocurrent investigalions.

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V. Raiverman ¹

Affiliations
1 708 Maitri Apartment, 255 NSC Bose Road, Kolkata- 700 047, IN

Abstract

This short note attempts to illustrate the efficacy of multiple-_Probe investigations in solving complex geological problems. The Cenozoic is the era of Alpine-Himalayan orogeny and the uplift pattern is one of long somnolence followed by brief hyperactivity. Nowhere else has this pattern been studied in greater detail than perhaps in the Himalaya. Classical stratigraphy, fossil records of flora and fauna, and sedimentologic, paleoclimatic and geomorphologic data offer sample evidence in this direction. Modern techniques of radiometric geochronology of the Himalayan crystallines also support this contention.

Keywords

Himalayan Uplift, Biostratigraphy, Sedimentology, Geochronology, Pattern Recognition.

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V. Raiverman ¹, V. Srinivasan ²

Affiliations
1 708, Maitri Apartments, 255, NSC Bose Road, Kolkata - 700 047, IN
2 Geological Survey of India, Tripura-Mizorarn Division, B.K. Road, Banamalipuram, Agartala-790 001, IN

Abstract

No Abstract.

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